I still pretty new to rays so heres another ? I have been keeping and breeding african cichlid's and when they got stressed and or were new to me and were not eating i would always treat them with Metronidazole power to help them start eating again. So today I got my new ray and she has not started to eat yet. she is really skinny so i do not want to wait to long to make sure she is eating. so just before i do add this I want to know if it will harm them? Also do i half dose it? Thank you again for helping me on one of my stupid questions.